Grinder Head Housing Layout for Spindle Lock and Motor Cooling
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Solution Overview
Problem
Existing grinders face challenges in efficiently cooling the motor due to limited outlet opening areas, which are constrained by the need to accommodate a locking assembly that locks the spindle for tool attachment and detachment.
Innovation Solution
A power tool design with a locking assembly positioned at the middle of the head housing laterally, allowing for increased outlet opening areas on the joint's front surface, including lateral, upper, and lower outlets to enhance cooling efficiency while maintaining the spindle's locking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft lock is located rightward in the gear housing to accommodate the locking assembly, then the spindle locking function is achieved, but the outlet opening area for motor cooling is reduced
Solution Approach 1:
The locking assembly is repositioned from a conventional rightward location to a centered lateral position in the head housing. This asymmetric redesign of the layout allows the outlets to be positioned on both sides of the locking assembly, effectively doubling the available outlet opening area while maintaining the locking function. The centered position creates symmetrical space distribution that optimizes both locking reliability and cooling efficiency.
Solution Approach 2:
The design utilizes the vertical dimension by positioning outlets above and below the compartment in addition to lateral outlets. This three-dimensional arrangement of outlets (lateral, upper, and lower positions) maximizes the total outlet opening area without increasing the lateral width of the housing, effectively using spatial dimensions to resolve the contradiction between locking assembly accommodation and cooling outlet area.
2Reliability
If the gear housing is made laterally wider to accommodate the locking assembly on the right, then the locking assembly can be properly positioned, but the overall housing size increases
Solution Approach 1:
The locking assembly is repositioned from a conventional rightward location to a centered lateral position in the head housing. This asymmetric redesign of the layout allows the outlets to be positioned on both sides of the locking assembly, effectively doubling the available outlet opening area while maintaining the locking function. The centered position creates symmetrical space distribution that optimizes both locking reliability and cooling efficiency.
3Reliability
If the compartment width is increased to match the joint width, then the locking assembly can be properly positioned, but the cooling outlet area is further constrained
Solution Approach 1:
The design utilizes the vertical dimension by positioning outlets above and below the compartment in addition to lateral outlets. This three-dimensional arrangement of outlets (lateral, upper, and lower positions) maximizes the total outlet opening area without increasing the lateral width of the housing, effectively using spatial dimensions to resolve the contradiction between locking assembly accommodation and cooling outlet area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves cooling efficiency by increasing airflow through larger outlets, reduces the gear compartment's height for better viewability, and maintains operability and durability of the locking assembly.
Implementation Method 1
a fan configured to cool the motor
Data Source
AI summary
A grinder includes a locking assembly to lock a spindle in a head housing and has outlets with a large opening area for high cooling efficiency. A grinder includes a main housing accommodating a motor and a fan, a spindle, a locking assembly that locks rotation of the spindle, and a head housing including a joint connected to a front of the main housing, and a compartment accommodating the spindle and the locking assembly. The compartment is laterally less wide than the joint. The locking assembly is located at a middle in a lateral direction of the head housing. The joint has, in a portion of a front surface of the joint, a first outlet at least on a right or a left of the compartment to discharge air for cooling the motor generated from rotation of the fan.